<template>
  <div>
<!--    面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
<!--  卡片视图区域-->
    <el-card>
<!--      警告区域-->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！"
            type="warning"
            :closable="false">
      <!--closable="false"表示隐藏后面的叉号-->
      </el-alert>

<!--        选择商品分类区域-->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类:</span>
<!--        选这商品分类的级联选择框-->
            <el-cascader expand-trigger="hover"
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange">
            </el-cascader>
          </el-col>
        </el-row>
<!--      tab页签区域-->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
<!--        添加动态参数的面板-->
        <el-tab-pane label="动态参数" name="many">
<!--          添加参数的按钮-->
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisable"
                     @click="addDialogVisible = true">
            添加参数
          </el-button>
<!--          动态参数表格-->
          <el-table :data="manyTableData" border stripe>
<!--            展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
<!--                循环渲染Tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :keys="i"
                        closable
                        @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
<!--                输入文本框-->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
<!--                添加按钮-->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
<!--            索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row,attr_id)">
                  删除
                </el-button>
              </template>
            </el-table-column>
            </el-table>
        </el-tab-pane>
<!--            添加静态属性的面板      -->
        <el-tab-pane label="静态属性" name="only">
<!--          添加属性的按钮-->
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisable"
                     @click="addDialogVisible = true">
            添加属性
          </el-button>
<!--          静态属性表格-->
          <el-table :data="onlyTableData" border stripe >
<!--            展开行-->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!--                循环渲染Tag标签-->
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :keys="i"
                        closable
                        @close="handleClose(i, scope.row)">
                  {{item}}
                </el-tag>
                <!--                输入文本框-->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!--                添加按钮-->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">
                  + New Tag
                </el-button>
              </template>
            </el-table-column>
<!--            索引列-->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini"
                           type="primary"
                           icon="el-icon-edit"
                           @click="showEditDialog(scope.row.attr_id)">
                  编辑
                </el-button>
                <el-button size="mini"
                           type="danger"
                           icon="el-icon-delete"
                           @click="removeParams(scope.row,attr_id)">
                  删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
<!--    添加参数的对话框-->
    <el-dialog :title="'添加' + titleText"
            :visible.sync="addDialogVisible"
            width="50%"
            @close="addDialogClosed">
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="addParams">确 定</el-button>
    <el-button @click="addDialogVisible = false">取 消</el-button>
  </span>
    </el-dialog>
<!--    修改参数的对话框-->
    <el-dialog :title="'修改' + titleText"
               :visible.sync="editDialogVisible"
               width="50%"
               @close="editDialogClosed">
      <el-form :model="editForm"
               :rules="editFormRules"
               ref="editFormRef"
               label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button type="primary" @click="editParams">确 定</el-button>
    <el-button @click="editDialogVisible = false">取 消</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data(){
      return {
        //商品分类列表
        catelist :[],
        //级联选择框的配置对象
        cateProps:{
          value:'cat_id',
          label:'cat_name',
          children:'children'
      },
        //级联选择框双向绑定的数组
        selectedCateKeys:[],
        //被激活的页签的名称(默认展示第一个页签，second则表示默认展示第二个页签)
        activeName: 'many',
        //动态参数的数据数组
        manyTableData:[],
        //静态属性的数据数组
        onlyTableData:[],
        //控制添加对话框的显示与隐藏
        addDialogVisible:false,
        //添加参数的数据表单对象
        addForm:{
          attr_name:''
        },
        //添加表单的验证规则对象
        addFormRules:{
          attr_name:[
              {required: true, message:'请输入参数名称' , trigger:'blur'}
          ]
        },
        //控制修改对话框的显示与隐藏
        editDialogVisible:false,
        //修改的表单数据对象
        editForm:{},
        //修改表单的验证规则对象
        editFormRules:[
          {required: true, message:'请输入修改的参数名称' , trigger:'blur'}
        ],
        //控制按钮与文本框的切换与显示
        inputVisible:false,
        //文本框中输入的内容
        inputValue:'',

      }
    },
    created(){
      this.getCateList()
    },
    methods: {
      //获取所有的商品分类列表
      async getCateList() {
        const {data: res} = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }

        this.catelist = res.data

        console.log(this.catelist);
      },
      //级联选择框中项变化，会触发这个函数
      handleChange() {
        this.getParamsData()
      },
      //tab 页签点击事件的处理函数
      handleTabClick() {
        console.log(this.activeName);
        this.getParamsData()
      },
      //获取参数的列表数据
      async getParamsData() {
        //证明选中的不是三级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }

        //证明选中的是三级分类
        console.log(this.selectedCateKeys);
        //根据所选分类的id,和当前所处的面板，获取对应的参数
        const {des: res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params: {sel: this.activeName}})

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }

        //赋值前将每一项都做一次循环,每循环一次就得到一个item项
        res.data.forEach(item => {
          this.attr_vals = item.attr_vals ?
              item.attr_vals = item.attr_vals.split('') : []
          //控制文本框的显示与隐藏
          item.inputVisible = false
          //文本框中输入的值
          item.inputValue = ''
        })

        console.log(res.data);

        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return
            const {data: res} = await this.$http.post(`categoies/${this.cateId}/attributes`,
                {
                  attr_name: this.addForm.attr_name,
                  attr_sel: this.activeName
                })
          }

          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
          }

          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      //点击按钮展示修改对话框
      async showEditDialog(attr_id) {
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {
              params: {attr_sel: this.activeName}
            })

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
              {
                attt_name:
                this.editForm.attr_name, attr_sel:
                this.activeName
              })

          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
          }

          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //根据id删除对应的参数项
      async removeParams() {
        const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)

        //用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }

        //删除的业务逻辑
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      //文本框失去了焦点，或摁下了Enter键都会被触发
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisable = false
          return
        }
        //如果没有return，则证明输入的内容，需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false

        //需要发起请求，保存这次操作
        this.saveAttrVals(row)
      },
      //将对attr_vals的操作保存到数据库
      async saveAttrVals(row){
        //需要发起请求，保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
              attr_name: row.attr_name,
              attr_sel: row.attr_sel,
              attr_vals: row.attr_vals.join('')
            })

        if(res.meta.status !== 200){
          return this.$message.error('修改参数项失败！')
        }

        this.$message.success('修改参数项成功！')
      },
      //点击按钮展示文本输入框
      showInput(row) {
        row.inputVisible = true

        //让文本框自动获得焦点
        //$nextTick 方法的作用：当页面上元素被重新渲染之后，才会指定回调函数中的代码
        this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      //删除对应的参数可选项
      handleClose(i, row){
       row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      }
    },
    //计算属性
    computed:{
      //如果按钮需要被禁用，则返回true,否则返回false
      isBtnDisable(){
        if(this.selectedCateKeys.length !== 3){
          return true
        }
        return false
      },
      //当前选中的三级分类的id
      cateId(){
        if(this.selectedCateKeys.length === 3){
          return this.selectedCateKeys[2]
        }
        return null
      },
        //动态计算标题的文本
       titleText(){
          if(this.activeName === 'many'){
            return '动态参数'
          }
          return '静态属性'
       }
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin:15px 0;
  }

  .el-tag{
    margin:10px;
  }

  .input-new-tag{
    width: 120px;
  }
</style>